I also have this issue. Creating seamless editing for updating web apps is a huge hurdle still. Also the symbology on ArcOnline is quite limited still, especially when it comes to basic polygon features. Outlines or solid fills is all you get. No hatched or textured styles are available. This is a real bummer. Sometimes if we publish a map out of ArcPro these more complex symbologies stick in ArcOnline, but if you need to update any symbology on the map we are forced to completely rebuild the map and republish it which means that I have to delete the old versions and reattach all my linked web applications. The new beta map viewer (although neat in a lot of ways) does not really seem to improve on the symbology limitations much from what I can see. This seems like it should be a pretty straight forward process to including more ArcGIS styles to the symbology list. The visualization aspect of web based cartography is what really catches peoples attention and brings your map to life. If these maps all look identical because of the extremely limited symbology then that is not ideal. I hope ESRI is sincerely working on improving this aspect in the near future. It is a huge limitation to managing web applications and web maps that require frequent editing.
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